Engine growl while accelerating

[Ekring67]

p0456 & Engine or exhaust growl

Here's the backstory......I recently took my 2011 4.6 sedan (27K miles) to the dealer for the second time for the engine light. First time about 5k miles ago and the cause was reported to be a loose wire on a sensor, not sure which sensor).

The light came back on about 10 days ago and a local parts store scanned it and told me it was P0456 (small evap leak) which is almost always associated with the gas cap. I checked the gas cap, drove it for about 10 days before I was able take it in for service on the light. I was told that the light literally went off as they were diagnosing. I thought how convenient and was suspicious but was glad that it was off.

When I drive the car now and accelerate I hear a growl in the engine, or possibly the exhaust. Its a growl that's usually associated with a turbo type engine or rapid acceleration from a performance car. It's not necessarily a problematic sound other than it never sounded like that before I took in for service yesterday. It goes away after a few seconds or when I let off the gas.

I do plan to take it back middle of next week.

I wonder if diagnosing the P0456 created the need to mess with the tuning of the engine and or exhaust?

Any thoughts?

 

[Ekring67]

bump....

 

[daviderle]

Re: p0456 & Engine or exhaust growl

When I drive the car now and accelerate I hear a growl in the engine, or possibly the exhaust. Its a growl that's usually associated with a turbo type engine or rapid acceleration from a performance car. It's not necessarily a problematic sound other than it never sounded like that before I took in for service yesterday. It goes away after a few seconds or when I let off the gas.

Any thoughts?

The first place, I would check to see if they messed around with the air filter housing and if any of air pipes became lose.

Next can you create the same sound while the car is in park? i.e. reving the engine? or does the sound only present while the car is under load (i.e. putting your foot down at a traffic stop?).

I you can create the sound while the car is in Park, open the bonnet (sorry the hood), stand by the engine, get someone else to rev the engine and try to localize where the sound is coming from?

Is the sound you describe coming from the intake (air filter & pipes)? the engine? or the exhaust?

Also did the light come back on?

 

[Ekring67]

Re: p0456 & Engine or exhaust growl

The first place, I would check to see if they messed around with the air filter housing and if any of air pipes became lose.

Next can you create the same sound while the car is in park? i.e. reving the engine? or does the sound only present while the car is under load (i.e. putting your foot down at a traffic stop?).

I you can create the sound while the car is in Park, open the bonnet (sorry the hood), stand by the engine, get someone else to rev the engine and try to localize where the sound is coming from?

Is the sound you describe coming from the intake (air filter & pipes)? the engine? or the exhaust?

Also did the light come back on?

The light has not come back on.

They did do a courtesy inspection that included the air filter. The sound will not occur unless I am in motion and pressing the gas pedal. When in park and reving the engine will not replicate the condition. I don't really think its the engine, more I think about it I want to say it's exhaust related since It only happens when accelerating.

For example, if I am driving at 40 mph, and I accelerate I hear the growl for a few seconds until the rpm's level off at a steady rate.

I just cannot understand why the exhaust would be tampered with to diagnose and fix a "small evap leak" code P0456. Even more odd is that the service tech told me the light went off as soon as he got in the car, which I think is not truthful given the fact that the growl was not there before. Someone did something to make this start happening.

I have a follow up appointment next week and am hoping for some more thoughts about this before I go back.

 

[Coolraul]

I believe the diag light and code going off once they started looking at it. I had the same thing happen but this was a very early model before they were shipping in Canada (I used to work for Hyundai and my company demo car was always the Genesis).

The in house experts said something like once the code was triggered it sometimes (maybe always) didn't reset but once they put it in diag mode it would clear and it did.

Regarding the growl -- it sounds like something like what the engine is supposed to sound like. I know that I like the engine acoustics when you stomp on the gas. Because you bring it up, it sounds like a new sound to you so I would take it in.

 

[Ekring67]

I believe the diag light and code going off once they started looking at it. I had the same thing happen but this was a very early model before they were shipping in Canada (I used to work for Hyundai and my company demo car was always the Genesis).

The in house experts said something like once the code was triggered it sometimes (maybe always) didn't reset but once they put it in diag mode it would clear and it did.

Regarding the growl -- it sounds like something like what the engine is supposed to sound like. I know that I like the engine acoustics when you stomp on the gas. Because you bring it up, it sounds like a new sound to you so I would take it in.

Well, yes the noise is something that you would expect from here from an engine like this when accelerating. It's just odd that I never heard it before like this. My wife rode with me today and confirmed it was a new sound.

 

[Thekirks]

My 2011 Genesis 4.6 did the exact same thing after having the alternator replaced at the dealer. Mechanic seamed to think it was the resonators. Not a performance issue, just a new noise and only under load. Anyone else have the same issue?

 

[G-892561]

My 2011 Genesis 4.6 did the exact same thing after having the alternator replaced at the dealer. Mechanic seamed to think it was the resonators. Not a performance issue, just a new noise and only under load. Anyone else have the same issue?

I have a 2012 Sonata and it does the same thing. They told me it was a belt but that did not solve the problem. Taking it back to dealership.

 

[Ambush]

I have the EXACT roaring when accelerating. What I have found it is burning oil! The car is telling me it is going dry. You can hear the timing chain guides/chain struggling. I hope that helps someone.

 

[SixFootSix]

I had a growling sound with my 5,0 and determined it was a partially clogged main air filter element. The flap located below the filter would open under acceleration and create the growl.

Check your air filter

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